Abstract
In MacPherson strut applications for automotive suspension systems, the desired coil spring reaction force vector that minimizes damper friction and king pin moment is typically determined by Statics/Kinematics calculations. There is not a single device available on the open market today which can simulate the coil spring reaction force vector within the suspension system. Such a programmable coil spring reaction force generator was developed in 2003, and was then improved in 2013 from the standpoint of accuracy, durability and reliability. Using this modified device, the relationship between the spring reaction force vector and damper friction, as well as spring reaction force vector and king pin moment, can be experimentally studied to confirm vehicle characteristics without actually making any prototype coil springs. The validity of this device was proven by comparing to actual coil spring based testing data. Depending upon the desired characteristics of a particular vehicle, the requirement for the coil spring reaction force vector can be experimentally determined with this device. To aid in this effort the device was designed in a universal manner for any strut application by mere replacement of strut-dependent seat adapters. This paper describes how beneficial this device is to determine the ideal requirement for coil spring reaction force vector via actual measured data.
